Im sending the invites with PHPMailer v5.2.6:
$mail = new PHPMailer();
$mail->Ical = $ICS;
This is working fine for invites but i need to find a way to get the Meeting into the organizers callendar. This is also possible with this method but kopano doesnt recognize him as the organizer which is needed in order to notify atendees whenever he changes something about the appointment.
I also tried importing the appointment thought the Ical/Caldav service but that didnt work either.
Here is an example ics invite
We are using DeskApp 2.6.2 and Kopano 8.7.12